Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Comments on this design?
Comments on this design?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 16th October 2003, 05:09 PM   #1
G is offline G  United States
diyAudio Member
G's Avatar
Join Date: Apr 2002
Location: Belleville, IL.
Default Comments on this design?

I'm building a SE EL34 amp that I designed and I managed to get a pair of Magnequest TFA 204 transformers for it. I have a small problem in that the transformers will only handle about 60mA of current through the primary before they start saturating so I will have to bias the EL34s at about 55mA or so to use them. I went looking around the net to see if I could find a design that ran them at that low of a current and came across this:


You'll notice that he is using a 880 ohm resistor on the cathodes of the EL34s and is showing 28 volts on the cathode which would of course mean that he is running a bias of about 32mA. This seems really low to me. Has anyone built this design or have experience with running EL34s at a lower than optimum bias? Thanks.

  Reply With Quote


Comments on this design?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Any comments on this design? icebear Tubes / Valves 23 19th May 2009 04:07 PM
Need comments on amp design mightydub Solid State 28 24th December 2008 01:01 AM
My first amp design - comments blueskynis Solid State 36 26th March 2008 03:38 PM
need comments on amp design metebalci Tubes / Valves 0 10th September 2006 08:03 PM
comments on this design.. GeirW Tubes / Valves 6 13th February 2004 08:24 AM

New To Site? Need Help?

All times are GMT. The time now is 12:51 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio